[GitHub] incubator-zeppelin pull request: Improve magic display system

[eranwitkon]

Github user eranwitkon commented on the pull request:

    https://github.com/apache/incubator-zeppelin/pull/164#issuecomment-128293669
  
    I changed the implementation according to the new rule:
    "paragraph type will be set by the first magic word in the paragraph" this 
allows for test such as the following to be parsed as before 
    ```
    println(s"some text before magic word %table col1\tcol2\naaa\t%html 
<h3>123</h3>\n")
    ```
    
![selection_005](https://cloud.githubusercontent.com/assets/2227083/9107293/d1e3812c-3c2e-11e5-8f45-fbed7eeb2adb.png)
    
    also support omitting text before magic word so magic can be used in spark 
code
    ```
    val somerdd = sc.parallelize(1 to 10)
    println("%table key\tvalue\nrdd count   \t%html <h3>" + somerdd.count 
+"</h3>\n")
    ```
    
![selection_006](https://cloud.githubusercontent.com/assets/2227083/9107403/9ca28610-3c2f-11e5-8c9f-19e66872163f.png)
    
    one thing to note is that it is up to the first magic word to handle the 
proceeding text. e.g. %table knows how to pars %html within it. but %table 
followed by %table will be handled differently.
    ```
    println("%table col A\tcol B\naaa\t123\n")
    println("%table col Z\naaa\n123\n")
    ```
    
![selection_007](https://cloud.githubusercontent.com/assets/2227083/9107510/6e61d8ea-3c30-11e5-89b1-8e43707ebd7c.png)
    
    if no more changes, this is ready for merge
    Eran
    
     


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